Both stars were in Indonesia for tvN cable TV show, World Love Special.
Both stars made friends with local children named Vicky (9), Dimas (7) and Putri (11) [they are the children in the picture.]
The children is currently living with their 70 years old grandmother who worked as a rubbish collector that will then be sell for recycled (what we called in Indonesian as Pemulung).
With 7.5 million won from donation, a classroom computer and basketball goalpost were donated to the school where the children are currently studying.
For more information, click here.
Yes, Indonesia in real life could be seen in this photo.
Thanks and credit to K-popped, Wikipedia.